High level expression of human MCP-1 using the LCR/MEL expression system

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• Human monocyte chemoattractant protein-1 (hMCP-1) is a key chemokine involved in inflammatory responses.
• Efficient expression and purification of biologically active hMCP-1 are crucial for research.
• Mouse erythroleukemia (MEL) C88 cells offer a potential system for recombinant protein production.

Purpose of the Study:

• To express and purify biologically active human monocyte chemoattractant protein-1 (hMCP-1) using a mouse erythroleukemia (MEL) cell expression system.
• To characterize the post-translational modifications and biological activity of recombinant hMCP-1.
• To develop an efficient purification strategy for separating glycosylated and unglycosylated forms of hMCP-1.

Main Methods:

• Expression of human monocyte chemoattractant protein-1 (hMCP-1) in preerythroid mouse erythroleukemia (MEL) C88 cells utilizing the locus control region/MEL expression system.
• Development of a two-step purification protocol involving dye ligand and ion exchange chromatography.
• Assessment of biological activity using various in vitro experimental systems.

Main Results:

• High-level expression of recombinant hMCP-1 (approximately 10 mg/liter) was achieved in the MEL C88 cell system.
• The recombinant hMCP-1 exhibited post-translational modifications similar to the native protein.
• Purified glycosylated and unglycosylated forms of hMCP-1 demonstrated equivalent biological activities across tested assays.

Conclusions:

• The locus control region/MEL expression system is effective for producing high-quality, biologically active human monocyte chemoattractant protein-1 (hMCP-1).
• A straightforward purification method allows for the separation of distinct hMCP-1 glycoforms.
• Both glycosylated and unglycosylated hMCP-1 variants possess comparable biological functions, suggesting flexibility in its functional mechanisms.